Variation control circuit having a displacement detecting functi

Details Variation control circuit having a displacement detecting functi Variation control circuit having a displacement detecting functi

1991-04-03

1993-01-12

Smith, Jerry

Boots, shoes, and leggings

73664, 248562, G05B 1918

Patent

active

051795167

ABSTRACT:
An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.

REFERENCES:
patent: 4750104 (1988-06-01), Kumamoto et al.
patent: 5034877 (1991-07-01), Shultz
patent: 5060519 (1991-10-01), Chojitani et al.

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